First thing about dealing with percentages: If your samples for each percentage are not the exact same then "mean" of a percentage is a misnomer at best and an outright lie at worst. Consider if a percentage of 15% is based on a population of 10,000 (1500/10000) and a second percentage of 13% is based on a population of 100 (13/100) when you average 15 and 13 you get 14. But the true percentage of the two groups combined is (1500 +13)/(10000+100) = 14.9802 %(rounded to 4 decimal places.
You may be better off with the data before you calculated means to get some of those summaries.
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